make: Prevent rebuilding all files when git commit changes

Author: tmewett

Makefile

@@ -27,7 +27,6 @@ extra_version :=
 else
 extra_version := $(shell bash tools/git-extra-version)
 endif
-cppflags += -DBROGUE_EXTRA_VERSION='"$(extra_version)"'
 
 ifeq ($(TERMINAL),YES)
 sources += $(addprefix src/platform/,curses-platform.c term.c)

make/o.mk

@@ -1,2 +1,5 @@
 $(sources:.c=.o): %.o: %.c src/brogue/Rogue.h src/brogue/Globals.h src/brogue/GlobalsBase.h vars/cppflags vars/cflags make/o.mk
 	$(CC) $(cppflags) $(cflags) -c $< -o $@
+
+src/variants/GlobalsBrogue.o src/variants/GlobalsRapidBrogue.o: vars/extra_version
+src/variants/GlobalsBrogue.o src/variants/GlobalsRapidBrogue.o: cppflags += -DBROGUE_EXTRA_VERSION='"$(extra_version)"'

src/brogue/Rogue.h

@@ -31,10 +31,6 @@
 #include <time.h>
 #include "PlatformDefines.h"
 
-#ifndef BROGUE_EXTRA_VERSION
-#error "The BROGUE_EXTRA_VERSION macro is undefined."
-#endif
-
 // unicode: comment this line to revert to ASCII
 #define USE_UNICODE